Reaktion #64289

Reaktionsgleichung

ethyl 8-ethoxycarbonyl-2-meth-yl-3-oxo-1-oxa-8-azaspiro[4,5]decane-4-carboxylate

sodium chloride

water

→

8-ethoxycarbonyl-2-methyl-1-oxa-8-azaspiro[4,5]-decan-3-one

Ausbeute 73.0%

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was heated
2. 2
   Sonstigeheld at 140°-150° C
3. 3
   Extraktionthe resulting mixture was extracted with chloroform
4. 4
   Waschenthe extract was washed with an aqueous solution of sodium chloride
5. 5
   Trocknendried over anhydrous magnesium sulfate
6. 6
   workup.DISTILLATIONAfter distilling off the solvent from the dried solution
7. 7
   Sonstigethe residue was purified by silica gel column chromatography

Vorschrift

To a solution of 2.74 g ethyl 8-ethoxycarbonyl-2-meth-yl-3-oxo-1-oxa-8-azaspiro[4,5]decane-4-carboxylate in 10 ml N,N-dimethylformamide, were added 512 mg sodium chloride and 315 μl water, and the mixture was heated with stirring for two hours in an oil bath held at 140°-150° C. The reaction mixutre was poured into 30 ml ice water, the resulting mixture was extracted with chloroform, and the extract was washed with an aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. After distilling off the solvent from the dried solution, the residue was purified by silica gel column chromatography using, as eluent, a mixed solvent of n-hexane/ethyl acetate (1:1 by volume), giving 1.54 g of 8-ethoxycarbonyl-2-methyl-1-oxa-8-azaspiro[4,5]-decan-3-one as oil.

Quelle